Screw-jack



(No Model.)

W. P. SMITH.

SGREWJAGK. No. 302,598. Patented July Z9, 1884.

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N PzTEn. Phono-unhognpmr. wmingnm ma Nrrnn Sins artnr @rencia WILLIAM P. SMITH, OF NEIV ORLEANS, LOUISIANA.

SCREW=JACK.

vT513ECIEIC'ATION forming part of Letters Patent No. 302,598, dated July 29, 1884.

Application filed June 4, 18S-l. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM l?. SMITI-I, a citizen of the United' States, residing in the city of New Orleans, parish oi` Orleans, State 0f Louisiana, have invented a new and useful Screw-Jack for Forcing Down Pipes for Sinking IVells, Src., of which the following is a specication.

My improvement relates to improvements in a screw-jack in which the screw is made hollow to admit of a pipe passing through it; and the object of my invention is to provide a means by which the power of a screw-jack can be applied directly t0 the pipe to be forced into' the ground and maintain the pipe in a perfectly perpendicular position. I attain Ithis object by the mechanism illustrated in the accompanying drawings, forming part of this specification, in which Figure l is aside elevation of the jack; Fig. 2, a plan view; Fig` 3, asection through plane N N, Fig. l.

Similar letters refer to .similar parts throughout the several views.

The hollow screw S is secured to the baseplate B by pins p p, the base-plate B being secured to a platform, P, by the bolts 'i The nut II is provided with a ring, A, which is made to revolve easily on the nut H, and is provided with the two journals N N, to which are attached the chains c c. The bottoni of nut is made hexagonshaped to receive the spanner i chine from lifting.

E, provided with the arms M M. The chains c c are attached to the clamp D b v the rodsr fr. The operation is as follows: The machine being placed over the location where the pipe is to be driven, the platform I? is then loaded with rocks or heavy weights, the weight on platform P being more than equal to the force required to drive the pipe, to keep the ina- The pipe, F, to be driven is placed in the hollow screwS, and the nut I-I run up to top of screw and the clamp D thoroughly secured to the pipe by the bolts o o, the chains c c being long enough to admit of the nut H being run to bottom ofscrew S before clamp D will reach the top of screw. By turning the nut ISI by the spanner E the pipe F is forced into the ground until the nn t H reaches the bottom of the screw S,when the clamp D is loosened and nut run up and another hold taken 0n the pipe F.

Vhat I claim as new, and desire to secure by Letters Patent, isl In a screw-jack for driving pipe, the combination of the hollow screw S, secured to the base B by pins p, with the nut II, provided with ring A, having journals N N and Spanner E, chains c c, and clamp I), all substantially as set forth, for the purpose specified.

XV. l. SMITH. Vitn'esses: i

J. THAYnR, E. Jo'nNsoN. 

